台湾著名女歌手--戴爱玲演唱的歌曲。
If n is something like 50, not a big number, 2 to the 50 is a huge number.
如果n是50,50不是一个大数,但2的50次方就是一个巨大的数。
If you substitute it all in, you get basically order 2 to the n.
得到的是2的n次方个基本问题,指数级的,这是个问题,好。
On the other hand, we've seen n that if the size of a is n, that's to say, we have n elements to choose from, then the number of possible subsets is 2 to the n.
另一方面,我们看到,如果a集合的大小是,也就是说我们有n个元素可供选择,而可能的子集的元素,个数就是2的n次方。
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